On Tue, 05 Apr 2005 20:43:35 GMT, "s" wrote:

Are watermelon seeds from summer before last still viable?

No! Watermelon seeds are typically produced from hybridized plants
and seeds from the ones you grow from those seeds will be in the
process of returning to the wild type. The wild types may be called
citrons and they become more and more like big gourds.

I hope I got these words right. Buying seeds to use each year is
best. I do not know about the other melons but it may apply to them
also.

Rusty Mase